International Journal on Technical and Physical Problems of Engineering (IJTPE) Published by International Organization of IOTPE
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1 International Journal on Technical and Physical Problems of Engineering (IJTPE) Published by International Organization of IOTPE ISSN IJTPE Journal June 2013 Issue 15 Volume 5 Number 2 Pages EFFECTIVE METHOD FOR OPTIMAL ALLOCATION OF DISTRIBUTED GENERATION UNITS IN RADIAL DISTRIBUTION SYSTEMS BY GENETIC ALGORITHM AND IMPERIALIST COMPETITIVE ALGORITHM Ma. Mozaffari Legha 1 A. Zargar Raeiszadeh 2 R. Abdollahzadeh Sangrood 3 M. Shadfar 4 1. Dept. of Power Engineering, Shoushtar Branch, Islamic Azad University, Shoushtar, Iran, mahdi_mozaffari@ymail.com 2. Department of Power Engineering, Kerman Branch, Science and Research, Islamic Azad University, Kerman, Iran ardalan.zargar@yahoo.com 3. Department of Power Engineering, Sari Branch, Islamic Azad University, Sari, Iran, abdollahzade@rocketmail.com 4. Department of Power Engineering, Mehriz Branch, Islamic Azad University, Mehriz, Iran, shadfar.mostafa@yahoo.com Abstract- This paper proposes Genetic Algorithm (GA) and Imperialism Competitive Algorithm (ICA) for solving optimal distributed generation () location and capacity. The objective is to imize network power loss and improve the voltage stability index within the frame-work of system operation and security constraints in radial distribution systems. A detailed performance analysis is carried out on 33 bus system to demonstrate the effectiveness of the proposed methodology. Two different objective functions are considered in this study: (1) imization of active power loss (2) imization of improve the voltage stability index. The goal is to optimize each objective function. The site and size of units are assumed as design variables. The results are discussed and compared with those of traditional distribution planning and also with GA and ICA. Keywords: Distributed Generation, Distribution Network Planning, Genetic Algorithm (GA), Imperialism Competitive Algorithm (ICA), Losses, Voltage Stability Index. I. INTRODUCTION Distribution systems are usually radial in nature for operational simplicity. The Radial Distribution Systems (RDS) are fed at only one point, which is the substation. The substation receives power from the centralized generating stations through interconnected transmission network. The end users of electricity receive electrical power from the substation through RDS, which is a passive network. Hence, the power flow in the RDS is unidirectional. The high R/X ratio of the distribution lines results in large voltage drops, low voltage stability and power losses. Under critical loading conditions in certain industrial areas, RDS experiences sudden voltage collapse due to low value of voltage stability index at most of its nodes [1-2]. Main reasons for the increasingly widespread usage of distributed generation can be summed up as follows [3]: Some technology have been perfected and are widely practiced (gas turbines, internal combustion engines), others are finding wider applications in recent years (wind, solar energy) and some particularly promising technologies are currently being experimented or even launched (fuel cell, solar panels integrated into buildings). The units are closer to customers so that Transmission and Distribution (T&D) costs are avoided or reduced. The CHP (Combined Heat and Power) groups do not require large and expensive heat networks. In order to achieve the aforementioned benefits, size has to be optimized. Researchers have developed many interesting algorithms and solutions. The differences are about the problem which is formulated, methodology and assumptions being made. Some of the methods are mentioned in [3] as analytical approaches [4] numerical programg, heuristic [5-6]. All methods own their advantages and disadvantages which rely on data and system under consideration. The allocation problem formulation of distributed generation is nonlinear, stochastic or evens a fuzzy function as either an objective function or constraints. Generally, in all formulations the objective function is to imize the real power losses and improve voltage; while abiding into all physical constraints equations in terms of voltage and power. The variable limits in the optimization procedure must also be obeyed. In distribution network planning, the planners usually focus on the voltage profile, power loss, and operation cost while satisfying different constraints such as safe operation and adequate service. Growing the load demand and competitive environment put emphasize both on cost and reliability of distribution networks. Cost is typically expressed as per KWh of supplied load. A way to assess the reliability is calculating the ratio of time interval in which the electric energy is available to the whole time. Traditional planning has been implemented by reconfiguration and reinforcement of network, load switching, and capacitor installation. 70
2 Nowadays, a great attention has been paid to the presence of distributed generation in distribution system planning. is generally defined as power generation through the relatively small units (from a few KWh up to 10 MW). The problem of optimal location and sizing is divided into two sub problems, where the optimal location for placement is the first and how to select the most suitable size is the second. Many researches proposed different methods such as analytic procedures as well as deteristic and heuristic methods to solve the problem. Keane and Malley [7] solved for the optimal sizing in the Irish system by using a constrained Linear Programg (LP) approach. The objective of their proposed method was to imize the generation. The nonlinear constraints were liberalized with the goal of utilizing them in the LP method. A unit was installed at all the system buses and the candidate buses were ranked according to their optimal objective function values. Kashem [8] developed an analytical approach to detere the optimal sizing based on power loss sensitivity analysis. Their approach was based on imizing the distribution system power losses. The proposed method was tested using a practical distribution system in Tasmania, Australia. Minimizing the system losses and total cost of, (Gandomkar et al., 2005; Lee and Park, 2009; Hamedani et al., 2009), improving the reliability indices and voltage profile (Wang and Nehrir, 2008; Zhu et al., 2006; Kim et al., 2008; Niknam et al., 2003), are some of the goals considered. This paper is organized as follow: A proposition is done for the problem formulation, the test power system and the optimization algorithm, after which the study discusses the simulation results from technical and economical points of view. Finally, the research is concluded. II. PROPOSED METHODOLOGY The real power loss in a system is given as: f P ( P, P,..., P ) (1) 1 Loss d1 d 2 d where P di stands for the rating capacity of distributed generation fixing in the i bus; P Loss is the system network loss in relation to dynamo electric location and capacity. Figure 1 shows a branch of radial system. In radial distribution system each receiving node is fed by only one sending node, from Figure 1. Vmi Vni Ii (2) R X ni ni * ni ( ) ni ( ) ni ni P ni Q ni V I (3) Figure 1. Representative Branch of a radial distribution system When distributed generation is connected to distribution network, the index of voltage stability for distribution network will be changed. This index, which can be evaluated at all nodes in radial distribution systems, was presented in [5]. The Equation (3) represents the voltage stability index. Using Equation (4): 4 2 mi ni ni ni ni mi SI( n2 ) V.4 P ( ni) R Q ( ni) X. V (4) 2 4 Pni ( ni) Rni. Qni ( ni) X ni The Objective function for improving voltage stability index is: 1 f2, i 2,3,..., n n (5) SI( ni) For stable operation of the radial distribution systems, SI (ni) > 0 for i = 2, 3,..., n n, so that; there exists a feasible solution and feasible solution. It is very important to identify weak buses for nodes with imum voltage stability index that are prone to voltage instability. Investigating the voltage stability index behavior demonstrate that the buses which experiencing large voltage drops are weak and within the context of remedial actions. So, it makes sense to act on controls that will improve the voltage magnitudes at weak buses. The constraints are as the followings: N P P V V Y cos( ) 0 (6) gi di i j ij i j ij j1 N Q Q V V Y sin( ) 0 (7) gi di i j ij i j ij j1 i i i, 0,1,..., n V V V i N (8) A capacity is inherently limited by the energy resource at any given location it is necessary to on strain capacity between imum and imum levels. gi gi gi P P P (9) gi gi gi Q Q Q (10) Final thermal limit of distribution lines of the network must not be exceeded, shown in Equation (11). i i, 1, 2,..., b S S i N (11) III. SOLUTION METHODOLOGY Following steps are involved in optimal sitting and sizing of in distribution system: - Step 1: set the time counter t 0 and generation X 0, j 1,, n, where randomly n chromosomes. j X j 0 [ X j,1 0, X j,2 0,, X j, m 0 ] X is generated in search space j, k 0, where k [ X, X ] randomly. - Step 2: evaluate each chromosome in the initial population using the objective function, J. The search for the best value of the objective function is J best. Set the chromosome associated with J best as the global best. - Step 3: update the time counter t = t + 1. k 71
3 - Step 4: create a new population by repeating the following steps until the new population is complete: Selection: select two parent chromosomes from a population according to their fitness Crossover: with a crossover probability, cross over the parents to form a new children. Mutation: with a mutation probability method mutate new children at each chromosome. Acceptance: place new children in a new population Step 5: use new generated population for a further run of algorithm. - Step 6: if one of the stopping criteria is satisfied then stop, else go to step 2. IV. THE FITNESS FUNCTION The limit conditions of upper and lower limit of distributed generation capacity are automatically satisfied in the phase of coding. Other limit conditions are plus to objective functions by penalty function. The improved formula of the objective function is in Equation (12). f {[ f k f [( V V,0) ( V V,0)] 1 i i, i, i in [( S S,0)]} 2 j j, jn (12) where β 1, β 2 and k 1 are the penalty coefficients, N is the branch number and k 1 rate is the distributed generation number. V. APPLICATION STUDY AND NUMERICAL RESULTS The proposed method for optimal multi-distributed generation has been implemented in the Matlab and tested for several power systems. In this section, the test results for Distribution system in [10] is presented and discussed. The studied distribution network is a radial system with the total load of 2.45 MW, 1.98 MVAR, 69 bus and 68 branches as it has been shown in Fig. 2. The real power loss in the system without is KW when calculated using the load flow method is based on that reported in [11, 14]. The optimization is performed using Genetic Algorithm and Imperialism Competitive Algorithm software package was written for simulation of load shedding in radial distribution systems with and without Distributed generations. The parameters used in GA algorithm are: Number of iterations is 33; Population size is 100; Cross over probability is 0.8; and Mutation probability is Also, the parameters used in ICA algorithm are: Number of Decade is 33; Population size is 100; Number of Empire 10; Revolution rate is 0.1. The Tables 1 and 2 show the methods which are compared, location (bus number), size, and real power losses in Figure 4 shows which are basic columns. The power loss calculation of ICA is less than the results of GA. After installing, the voltage level for that bus is improved. Furthermore, the voltage levels at all nodes for RDS have improved. Convergence values for GA and ICA fitness functions are illustrated in Figure 3. Fitness 2.6 x Figure 2. Single line diagram of a 69-bus distribution Iteration Figure 3. Convergence values for GA and ICA fitness functions Table 1. Optimal place and size of the in 69-bus systems sing Imperialism Competitive Algorithm (ICA) Bus location Capacity [MW] Table 2. Optimal place and size of the in 69-bus systems using Genetic Algorithm (GA) Bus location Capacity [MW] ICA GA 72
4 The voltage profile for ICA and GA method is given in Figures 5 and 6. It can be seen that the voltage profile achieved by GA and ICA optimization algorithms are almost the same while having better improvement in compare with no state. The real power loss are KW and KW, which is approximately 5.654% and 5.433% in compare with No state design for GA and ICA, respectively Figure 4. Bar losses profile with & without in 69-bus system Loss without Loss with _ ICA Loss with _ GA Figure 5. Voltage profile with and without s in 69-bus system using Genetic Algorithm (GA) Figure 6. Voltage profile with and without s in 69-bus system using Imperialism Competitive Algorithm (ICA) VI. CONCLUSIONS This paper is organized as follow: A proposition is done for the problem formulation, the test power system and the optimization algorithm, after which the study discusses the simulation results from technical and economical points of view. When installation and operation of distributed generation supplies are implemented based on optimization procedures, it can Without With With Without Loss [W] provide significant technical and economic advantages for the distribution companies. Regarding the various parameters which are effective in optimally locating the units, solving this problem has always been concerned with special complexity. In this paper, ICA and GA is proposed for optimal multi-distributed generation location and size. Test results indicate that the ICA algorithm is efficiently finding the optimal multidistributed generation; compared to GA. REFERENCES [1] T. Ackermann, G. Anderson, L.S. Soder, Distributed Generation: A Definition, Electric Power Systems Research, Vol. 57, No. 3, pp , [2] N. Jenkins, R. Allan, P. Crossley, D. Kirschen, G. Strbac, Embedded Generation, The Institution of Electrical Engineers, London, First Edition, [3] W. El-Khattam, M.M.A. Salama, Distributed Generation Technologies Definitions and Benefits, Electric Power Systems Research, Vol. 71, pp , [4] H.N. Salama, M.M. Ng, A.Y. Chikhani, Capacitor Allocation by Approximate Reasoning: Fuzzy Capacitor Placement, IEEE Trans. on Power Delivery, Vol. 15, No. 1, pp , [5] R.A. Gallego, A.J. Monticelli, R. Romero, Optimal Capacitor Placement in Radial Distribution Networks, IEEE Trans. on Power Systems, Vol. 16, No. 4, pp , [6] P. Varilone, G. Carpinelli, A. Abur, Capacitor Placement in Unbalanced Power Systems, 14th Power Systems Computation Conference, Sevilla, Session 3, pp , [7] A. Kean, M. Omalley, Optimal Allocation of Embedded Generation on Distribution Networks, IEEE Trans. on Power Systems, pp , [8] M.A. Kashem, A.D.T. Le, M. Negnevitsky, G. Ledwich, Distributed Generation for Minimization of Power Losses in Distribution Systems, IEEE Trans. on Power Engineering Society General Meeting, pp , [9] W. Prommee, W. Ongsakul, Optimal Multi- Distributed Generation Placement by Adaptive Weight Particle Swarm Optimization, International Conference on Control, Automation and Systems, Oct [10] M. Vatankhah, S.M. Hosseini, PSO Based Voltage Profile Improvement by Optimizing the Size and Location of S, International Journal on Technical and Physical Problems of Engineering (IJTPE), Issue 11, Vol. 4, No. 2, pp , 2 June [11] Ma. Mozaffari Legha, Deteration of Exhaustion and Junction of in Distribution Network and its Loss Maximum, due to Geographical Condition, M.Sc. Thesis, Saveh Branch, Islamic Azad University, Saveh, Iran, [12] A. Rost, B. Venkatesh, C.P. Diduch, Distribution System with Distributed Generation Load Flow in Large Engineering Systems, Conference on Power Engineering, pp ,
5 [13] W. Kuersuk, W. Ongsakul, Optimal Placement of Distributed Generation Using Particle Swarm Optimization, Australian Universities Power Engineering Conference (AUPEC 06), Dec [14] O. Amanifar, M.E. Hamedani Golshan, Optimal Distributed Generation Placement and Sizing for Loss THD Reduction and Voltage Profile Improvement in Distribution Systems Using Particle Swarm Optimization and Sensitivity Analysis, International Journal on Technical and Physical Problems of Engineering (IJTPE), Issue 7, Vol. 3, No. 2, pp , March BIOGRAPHIES Mahdi Mozaffari Legha was born in Kerman, Iran. He received the M.Sc. degree from Saveh Branch, Islamic Azad University, Saveh, Iran. He is a lecturer of Power Electrical Engineering at Shoushtar Branch, Islamic Azad University, Shoushtar, Iran and teaches power system analysis, distribution systems and electrical machine. His research interests are including in the stability of power systems and power distribution systems, reliability and preventative maintenance. He has presented more than 5 journal papers and 30 conference papers. Ardalan Zargar Raeiszadeh was born in Rafsanjan, Iran, in He received his B.Sc. degree in Electrical Engineering from Anar Branch, Islamic Azad University, Anar, Kerman, Iran in He is a M.Sc. student in Power Engineering at Science and Research Branch, Islamic Azad University, Kerman, Iran. His research interests are including power system, restructured power system and FACTS devices, power system dynamics and control. Rouhollah Abdollahzadeh Sangrood was born in Babol, Iran, in He received his B.Sc. degree in Electrical Engineering from Nour Branch, Islamic Azad University, Nour, Mazandaran, Iran in He is a M.Sc. student in Power Engineering at Sari Branch, Islamic Azad University, Sari, Iran. His research interests are including power system, restructured power system and FACTS devices, power system dynamics and control. Mostafa Shadfar was born in Babol, Iran, in He received his B.Sc. degree in Electrical Engineering from Nour Brach, Islamic Azad University, Nour, Mazandaran, Iran in He is a M.Sc. student in Power Engineering at Mehriz, Branch, Islamic Azad University, Mehriz, Iran. He is interests are included FACTS devices, power system dynamics and control. 74
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